Question

Помогите пожалуйста со 2,3(б) и 5 заданием

Answer 1

2a
формула a²-b²=(a-b)(a+b)
получится  $9m ^{1/2} -n$
2б
формула a³+b³=(a-b)(a²-ab+b²)
получится  $m ^{3/2} +8n^3$
3б
формула a²-b²=(a-b)(a+b)
получится  $(5 sqrt{5} ) ^{-4/3} -81 ^{-1/2} =5 ^{-2} -1/ sqrt{81} =1/25-1/9=-16/225$
5
1)$3/(x ^{1/4} + y^{1/4} )+3/( x^{1/4} -y ^{1/4} )=3(x ^{1/4} -y ^{1/4} +x ^{1/4} +y ^{1/4} )/$$(x ^{1/2} -y ^{1/2} )=6x ^{1/4} /( x^{1/2} -y ^{1/2} )$
2)$1/ ^{1/2} -1/ x^{1/2} =( x^{1/2} -y ^{1/2} )/(xy) ^{1/2}$
3)$6x ^{1/4} /( x^{1/2} -y ^{1/2} )*(x ^{1/2} -y ^{1/2} )* ^{1/4} y ^{1/2} /4x ^{1/2} y ^{1/2} =1,5$